At True Cross Academy, Rin Okumura inadvertently discovers the first indications that something is wrong; ordinary people are beginning to sense the unseen beings that haunt the human world, Assiah. While Rin views this as a chance to forge a new friendship, his twin brother Yukio feels more burdened than ever. Overwhelmed by studies, exorcist responsibilities, and a teaching role, Yukio keeps his awakened abilities hidden, unable to grasp their magnitude or importance.
As Rin and his companions gear up for the yearly Exorcist Certification Exam, the True Cross Order reveals a newly constructed artificial portal to the demonic realm of Gehenna. Observing its enormity and the cutting‑edge technology behind it, the exorcists realize they are confronting the Illuminati—an exceptionally affluent and influential group. Additionally, the enigmatic Illuminati have embedded three infiltrators within the True Cross Order—and one may be among the novice exorcists pledged to defend humanity from demonic peril.
